A close-up of cannabis flower can look like a dusting of frost. Zoom in further, and that sparkling surface starts to resolve into tiny rounded heads, some perched on slender stalks.
That frost is trichomes. Tiny resin glands where the plant makes and stores cannabinoids and terpenes. Here's what's inside, and why frost alone isn't a potency score.
What is a trichome?
A trichome is a small outgrowth on a plant's surface. Cannabis has two kinds: plain nonglandular hairs, and glandular trichomes, the resin glands that make and store compounds like cannabinoids and terpenes.
Researchers describe three glandular types on cannabis flowers:
- Stalked: A rounded head raised above the surface on a noticeable stalk.
- Sessile: A rounded head that sits much closer to the surface.
- Bulbous: A much smaller glandular structure.
These aren't three grades of flower. They're anatomy. A microscopy study in The Plant Journal found the differences go deeper than shape: the big stalked glands are where most of the cannabinoid and terpene production happens. (Source: The Plant Journal, cannabis trichome anatomy)
What's inside that little head?
Picture a cross-section through a gland head. Near its base sits a group of specialized cells arranged like a small disc. Above them is a storage space, sealed under an outer layer called the cuticle.
The disc cells make the compounds that collect in that space. Researchers call it an extracellular cavity, which just means the storage space sits outside the cells themselves while staying enclosed in the gland head.
A 2021 study used electron microscopy to watch that cavity form. Cell wall layers separated to make room for stored material, and tiny droplets merged into bigger ones as the gland developed. (Source: Plant and Cell Physiology, the trichome storage cavity)
So the familiar mushroom shape is only the outside view. Inside, it's organized cells, walls, a seal, and a storage tank.
Those heads are delicate, too. Heat and rough handling knock them loose, which is one more reason how you store your flower matters.
Small gland, busy cells
In a 2022 study, researchers found extensive connections between the compound-making cells and an organized setup of structures inside them. They also pinpointed an enzyme involved in the final step of THCa production in the cell wall that faces the storage cavity. (Source: research on trichome cell organization, 2022)
You'd need a lab-grade microscope to see any of this.
If you're curious about the aroma side of this chemistry, our guide to terpenes and cannabis scent picks up that thread. For this close-up, the takeaway is simple: the frost on the surface is the plant's production and storage system.
Can you judge potency by the frost?
It's tempting to line up two photos and crown the frostier one. There's a reason for the instinct: those stalked glands do most of the cannabinoid work, so frost isn't meaningless.
But a photo can't give you a number. Lighting, camera angle, trim, and handling all change how frosty flower looks, and frost can't tell you which cannabinoids are in there or how much. Measuring that takes a lab. NIST, the U.S. measurement-science agency, even makes a hemp reference material with assigned values so labs can check their own methods. (Source: NIST hemp reference material) It's also part of why two lab reports can show different numbers.
“Frosty” describes what caught your eye. It doesn't hand you a THCa percentage, tell you a sample is safe, or predict how someone will feel.
Our diamond-coated prerolls are a different story. That sparkle is concentrate and diamonds added to the outside of the preroll, not the plant's own trichomes.
For the numbers, check the batch's lab report and see what was actually measured. Our guide on how to read a COA walks you through it, and what THCa percentage means explains why one number never tells the whole story.
The short version
Next time you see frost up close, you'll know what you're looking at. Want the numbers? Check the COA.
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